If so, please edit your post to include it in the Tell us what’s happening section.
Learning to describe problems is an important part of learning how to code.
Also, the more information you give us, the more likely we are to be able to help.
The lesson says
Add a DOCTYPE tag for HTML5 to the top of the blank HTML document in the code editor. Under it, add opening and closing html tags, which wrap around an h1 element. The heading can include any text.